Resolve 17.2 no sound

Hello,
with Resolve 17.2 I dont have any sound output.
Also there ist no sound level in the meters on the edit page.
In the timeline, it displays the sound curve, but it doesn't display any sound in the meter and also I can't hear any sound.
On the fairlight-page ist dislpays the sound level in the audio-meter from the track and also in the "main" meter.
But also I can't listen the sound on the fairlight page.
When I render out the clip, in the delivered result, the sound is perfectly included.
It only doesn't work inside Resolve.
I'm on Windows 10 20H2.
Is it necessary to update to 21H1 ?
Resolve studio 17.2
Thanks for your help.
Peter
with Resolve 17.2 I dont have any sound output.
Also there ist no sound level in the meters on the edit page.
In the timeline, it displays the sound curve, but it doesn't display any sound in the meter and also I can't hear any sound.
On the fairlight-page ist dislpays the sound level in the audio-meter from the track and also in the "main" meter.
But also I can't listen the sound on the fairlight page.
When I render out the clip, in the delivered result, the sound is perfectly included.
It only doesn't work inside Resolve.
I'm on Windows 10 20H2.
Is it necessary to update to 21H1 ?
Resolve studio 17.2
Thanks for your help.
Peter